We experimentally demonstrate a convenient method to fabricate two-dimensional photonic microstructures in photorefractive crystal. Three kinds of photonic microstructures have been fabricated in iron-doped lithium niobate crystal using six wedge prisms array. The experimental setup of our method does not require complicated optical alignment components. Induced two-dimensional triangular lattice photonic microstructures are analyzed and validated by plane wave guiding, far-field diffraction pattern imaging, Brillouin-zone spectroscopy, and angle-dependent transmission spectrum. The method can be easily extended to fabricate other complex photonic microstructures by designing different wedge prisms array and adjusting polarization and phase delay properly.

我们实验证明了在光折射晶体中制造二维光子微结构的便捷方法。使用六个楔形棱镜阵列，在掺铁铌酸锂晶体中制造了三种光子微结构。我们方法的实验设置不需要复杂的光学对准组件。通过平面波导，远场衍射图成像，布里渊区光谱和与角度有关的透射光谱，对诱导的二维三角晶格光子微结构进行了分析和验证。通过设计不同的楔形棱镜阵列并适当调整偏振和相位延迟，可以轻松地将该方法扩展为制造其他复杂的光子微结构。